Move Dependencies to NPM and bundle using Browserify

[maxdumas]

Trying to solve #125 & #119 has made me realize that our dependencies are kind of a mess right now. Keeping track of which versions we're using, making sure they load in the correct order, and request-bombardment are all becoming issues. Using Browserify is a smart move in the long run and it will make our code a lot more reusable and our dependencies centrally managed. I also think it will directly fix the flaky behavior that we're seeing in #119.

That said, we would need to modify the deploy script to invoke browserify in some way. I'm not totally sure what is available to us from CircleCI; it looks like we're auto-provisioning turbolift to execute the deploy right now. Can we execute npm scripts from CircleCI? @AbhiAgarwal

[AbhiAgarwal]

Hey @maxdumas! Yup :) We can run npm scripts from CircleCI.

Just let me know the commands to put in and what we need to do.